ST72314J/N(2003) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST72314J/N
(Rev.:2003)
(Rev.:2003)
STMicroelectronics
ST72314J/N Datasheet PDF : 153 Pages
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ST72334J/N, ST72314J/N, ST72124J
8-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy
Symbol
Parameter
|ET| Total unadjusted error 1)
EO Offset error 1)
EG Gain Error 1)
|ED| Differential linearity error 1)
|EL| Integral linearity error 1)
VDD=5V, 2)
fCPU=1MHz
Typ. Max
2.0
1.5
1.5
1.5
1.5
Figure 99. ADC Accuracy Characteristics
Digital Result ADCDR
255
254
253
1LSBIDEAL
=
V-----D-----D----A------–----V-----S----S----A---
256
(2)
7
ET
(3)
6
5
EO
EL
4
3
ED
2
1
1 LSBIDEAL
EG
(1)
0
1234567
VSSA
253 254 255 256
VDDA
VDD=5.0V, 3)
fCPU=8MHz
Typ. Max
2.0
1.5
1.5
1.5
1.5
VDD=3.3V, 3)
fCPU=8MHz
Typ Max
2.0
1.5
1.5
1.5
1.5
Unit
LSB
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
ET=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
EO=Offset Error: deviation between the first actual
transition and the first ideal one.
EG=Gain Error: deviation between the last ideal
transition and the last actual one.
ED=Differential Linearity Error: maximum deviation
between actual steps and the ideal one.
EL=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
Vin (LSBIDEAL)
Notes:
1. ADC Accuracy vs. Negative Injection Current:
For IINJ-=0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of 1 LSB
for each 10KΩ increase of the external analog source impedance. This effect on the ADC accuracy has been observed
under worst-case conditions for injection:
- negative injection
- injection to an Input with analog capability, adjacent to the enabled Analog Input
- at 5V VDD supply, and worst case temperature.
2. Data based on characterization results with TA=25°C.
3. Data based on characterization results over the whole temperature range.
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